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B. FRESH AIR SUPPLY REQUIREMENTS
When the dryer is operating, it draws in room air, heats it, passes this air through the tumbler (basket), and
exhausts it out of the building. Therefore, the room air must be continually replenished from the outdoors. If
the make-up air is inadequate, drying time and efficiency will be adversely affected. Ignition problems and sail
switch fluttering problems may result, as well as premature motor failure from overheating.
Air supply (make-up air) must be given careful consideration to assure proper performance of each dryer. An
unrestricted source of air is necessary for each dryer. An airflow of 9,200 cfm (cubic feet per minute) - 260.52
cmm (cubic meters per minute) - must be supplied to each gas dryer and 12,000 cfm (cubic feet per minute) -
339.80 cmm must be supplied to each steam dryer. As a general rule, an unrestricted air entrance from the
outdoors (atmosphere) of a minimum of 12 square feet (1.15 square meters) is required for each gas dryer and a
minimum of 14 square feet (1.30 square meters) is required for each steam dryer.
To compensate for the use of registers or louvers used over the openings, this make-up air area must be increased
by approximately thirty-three percent (33%). Make-up air openings should not be located in an area directly
near where exhaust vents exit the building.
It is not necessary to have a separate make-up air opening for each dryer. Common make-up air openings are
acceptable. However, they must be set up in such a manner that the make-up air is distributed equally to ALL
the dryers.
Allowances must be made for remote or constricting passageways or where dryers are located at excessive
altitudes or predominantly low pressure areas.
IMPORTANT: Make-up air must be provided from a source free of dry cleaning solvents
fumes. Make-up air that is contaminated by dry cleaning solvent fumes will
result in irreparable damage to the motors and other dryer components.
NOTE: Component failure due to dry cleaning solvent fumes will VOID THE WARRANTY.
1. Optional Inlet Air Adapter
The MLG-410 dryer may be built with the inlet air adapter option. This option allows ALL of the dryers
inlet air to be ducted from the outdoors directly to the dryer.
This option consists of a sheet metal box located on top of the dryer with two (2) 30-inch (76.2 cm)
diameter duct collars on top. (Refer to the illustration on page 22 for the location and dimensions of the
inlet air adapter.)
Use two (2) 30-inch (76.2 cm) diameter flexible hoses to connect the 30-inch (76.2 cm) collars to the
outdoors. Allow enough slack in the flexible hoses so that the dryer can tilt, without restriction.